[ci skip] prepare release 0.3.0

Author: github-actions[bot]

pom.xml

@@ -4,7 +4,7 @@
 
   <groupId>land.oras</groupId>
   <artifactId>oras-java-sdk</artifactId>
-  <version>0.3.0-SNAPSHOT</version>
+  <version>0.3.0</version>
   <packaging>jar</packaging>
   <name>${project.groupId}:${project.artifactId}</name>
   <description>ORAS Java SDK</description>
@@ -29,7 +29,7 @@
   <scm>
     <connection>scm:git:[email protected]:oras-project/oras-java.git</connection>
     <developerConnection>scm:git:[email protected]:oras-project/oras-java.git</developerConnection>
-    <tag>HEAD</tag>
+    <tag>0.3.0</tag>
     <url>https://github.com/oras-project/oras-java</url>
   </scm>
 
@@ -45,7 +45,7 @@
 
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 
-    <project.build.outputTimestamp>2025-10-08T10:11:58Z</project.build.outputTimestamp>
+    <project.build.outputTimestamp>2025-10-13T08:57:37Z</project.build.outputTimestamp>
 
     <spotless.check.skip>false</spotless.check.skip>
     <enforcer.skip>false</enforcer.skip>